Overseas this evening to afghanistan where we can't forget our u.S. Troops and tonight we learn of two separate attacks. Seven american troops killed, 19 this week. This comes days after the dramatic video of an american plane coming down at a u.S. Air Reporter: The first attack at kandahar, five americans riding in a vehicle hit by a road side bomb. Later in afghanistan an insider attack, an afghan soldier turned his gun on two americans, killing them both. This is now the deadliest week of the year for americans. On friday a refueling plane on its way into the country from neighboring kyrgyzstan crashed killing all three americans on board. On monday these horrifying moments, this civilian cargo plane had just taken off. You can see the plane stalling in mid air before it drops straight to the ground. All seven american crew members on board never stood a chance and died instantly. Reporter: Today's attacks come as the taliban's annual fighting season is less than a week old. That's raising concerns that this summer could be the deadliest one yet.

This transcript has been automatically generated and may not be 100% accurate.

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